Primary Total Hip Arthroplasty Using an Uncemented Wagner SL Stem in Elderly Patients With Dorr Type C Femoral Bone

摘要

The purpose of this study was to review retrospectively the primary total hip arthroplasties operated upon with the cementless Wagner self-locking stem in patients with Type C femoral bone. Twenty-five total hip arthroplasties were performed in 23 patients aged >= 60 years using a cementless Wagner self-locking femoral component between 2006 and 2011. According to Dorr's criteria, all 25 femora were classified as type C bone. Mean follow-up period was 62 months (range, 47-85 months). Average Harris Hip score preoperatively was 46 +/- 9 (range, 39-62) and at the last follow-up was 90 +/- 9 (range, 83-98). The mean proximal stem-to-canal fill percentage was 95% +/- 3.5% (anteroposterior view) and 90% +/- 2.8% (lateral view) and the mean distal canal fill was 93% +/- 4.5% (anteroposterior) and 92% +/- 3.9% (lateral). Radiographic evaluation demonstrated good osteointegration of the implants in follow-up. Based on the long-straight cylindrical tapered stem design, the cementless Wagner SL stem can achieve reliable stability by close apposition of stem and wide stovepipe femoral canal from metaphysis to diaphysis in Type C bone.